CN111219594A - LNG storage tank gas transmission and replacement process - Google Patents

LNG storage tank gas transmission and replacement process Download PDF

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Publication number
CN111219594A
CN111219594A CN202010009489.4A CN202010009489A CN111219594A CN 111219594 A CN111219594 A CN 111219594A CN 202010009489 A CN202010009489 A CN 202010009489A CN 111219594 A CN111219594 A CN 111219594A
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CN
China
Prior art keywords
storage tank
pipeline
lng storage
nitrogen
gasification
Prior art date
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Pending
Application number
CN202010009489.4A
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Chinese (zh)
Inventor
童宣民
谢广飞
杨磊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuyang Guocheng Gas Co ltd
Original Assignee
Fuyang Guocheng Gas Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuyang Guocheng Gas Co ltd filed Critical Fuyang Guocheng Gas Co ltd
Priority to CN202010009489.4A priority Critical patent/CN111219594A/en
Publication of CN111219594A publication Critical patent/CN111219594A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/06—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with compressed gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/12—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F17C7/02—Discharging liquefied gases
    • F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D3/00—Arrangements for supervising or controlling working operations
    • F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/014—Nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0107—Single phase
    • F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0135—Pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/04—Methods for emptying or filling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/04—Reducing risks and environmental impact
    • F17C2260/042—Reducing risk of explosion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/06—Fluid distribution

Abstract

The invention provides a gas transmission and replacement process of an LNG (liquefied natural gas) storage tank, which comprises the LNG storage tank and a nitrogen filling device connected with the LNG storage tank and used for replacing natural gas, wherein the nitrogen filling device comprises a liquid nitrogen storage tank, a gasification assembly used for liquid nitrogen and an inflation assembly used for filling nitrogen into the LNG storage tank, and a buffer tank used for storing nitrogen is arranged between the gasification assembly and the inflation assembly. When the LNG storage tank is used for natural gas replacement, the pressure in the LNG storage tank is reduced through the vacuum pump, the first nitrogen charging pipeline and the second nitrogen charging pipeline charge nitrogen into the LNG storage tank, and the gas is exhausted through the first exhaust pipeline and the second exhaust pipeline, so that gas retention at dead corners in the LNG storage tank is reduced, and the gas exhaust efficiency in the LNG storage tank is improved. The device has the advantages of simple structure, simple operation, easy control, economy, practicality, high replacement efficiency and the like.

Description

LNG storage tank gas transmission and replacement process
Technical Field
The invention relates to the technical field of LNG storage, in particular to a gas transmission and replacement process of an LNG storage tank.
Background
In enterprises in the gas industry, several or even more than ten gas storage ball tanks are generally required to be built for peak regulation or short-term gas stopping storage in a gas consumption peak, a sub-high-pressure natural gas storage ball tank for peak regulation belongs to a pressure container, according to the regulations of pressure container safety technology supervision regulations and pressure container regular inspection rules, tank opening detection needs to be carried out regularly, the ball tank which stops running is filled with natural gas, the natural gas belongs to flammable and explosive gas, and the ball tank filled with the natural gas is also in a flammable and explosive state.
Before the storage tank is detected, the storage tank needs to be replaced, and the detection work is ensured to be safely and smoothly carried out. Tank replacement is a dangerous task, and if the replacement scheme is improperly selected or mishandled, an explosion may occur, resulting in catastrophic loss. For this reason, the safety problem of tank replacement is particularly important; secondly, economic benefits and operation convenience should also be considered in storage tank replacement, and if the scheme is improper, the replacement work load will be large, and the expense is high.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a gas transmission and replacement process for an LNG storage tank, so as to solve the problems in the background art.
The technical problem solved by the invention is realized by adopting the following technical scheme: the LNG storage tank gas transmission and replacement process comprises an LNG storage tank and a nitrogen filling device connected with the LNG storage tank and used for replacing natural gas, wherein the nitrogen filling device comprises a liquid nitrogen storage tank, a gasification assembly used for liquid nitrogen and an inflation assembly used for filling nitrogen into the LNG storage tank, and a buffer tank used for storing nitrogen is arranged between the gasification assembly and the inflation assembly; the gas charging assembly is provided with a first nitrogen charging pipeline and a second nitrogen charging pipeline in parallel corresponding to the LNG storage tank, the first nitrogen charging pipeline is connected with a valve port of a lower end sealing cover of the LNG storage tank, and the second nitrogen charging pipeline is connected with a valve port of an upper end sealing cover of the LNG storage tank; the LNG storage tank is provided with a first exhaust pipeline and a second exhaust pipeline corresponding to the inflation assembly for exhausting, the first exhaust pipeline is connected with an exhaust port of a lower end sealing cover of the LNG storage tank, and the second exhaust pipeline is connected with an exhaust port of an upper end sealing cover of the LNG storage tank; the upper end of the LNG storage tank is connected with a vacuum pump through a pipeline so as to discharge natural gas in the storage tank in an earlier stage.
The further scheme of the invention is as follows: the gasification assembly comprises a gasification pipeline connected with the liquid nitrogen storage tank, an air-temperature gasifier arranged on the gasification pipeline in series and a water bath type gasifier arranged on the gasification pipeline; the water bath type gasifier is connected to the gasification pipeline in parallel through the gasification branch pipe, the gasification branch pipe is provided with a branch pipe ball valve for controlling on-off, and a first ball valve is arranged between the gasification pipeline and the corresponding gasification branch pipe; specifically, the first ball valve is closed, the two branch pipe ball valves are opened, and nitrogen in the gasification pipeline passes through the water bath type gasifier to be completely gasified.
The further scheme of the invention is as follows: the one end that empty temperature vaporizer was located the liquid nitrogen storage tank of keeping away from on the gasification pipeline is equipped with first manometer and first thermometer, be equipped with the check valve between gasification subassembly and the buffer tank.
The further scheme of the invention is as follows: the inflation assembly comprises a pressure regulator, a gas flowmeter, a second pressure gauge and a pneumatic cut-off valve which are sequentially installed on the pipeline, and the pneumatic cut-off valve is far away from the pipeline of one end of the second pressure gauge and is connected with a first nitrogen charging pipeline and a second nitrogen charging pipeline in a tapping mode.
The further scheme of the invention is as follows: the first nitrogen charging pipeline and the second nitrogen charging pipeline are respectively provided with a second ball valve and a third ball valve which are independently controlled to be on and off, and the first exhaust pipeline and the second exhaust pipeline are respectively provided with a fourth ball valve and a fifth ball valve which are independently controlled; the first exhaust line and the second exhaust line are connected in a gathering manner to a residual gas collecting tank.
The invention comprises a gas transmission and replacement process of an LNG storage tank, which comprises the following steps:
the method comprises the following steps that firstly, natural gas in an LNG storage tank is conveyed to a medium-pressure pipe network, and when pressure conveying is not enough provided, the natural gas is extracted by a vacuum pump to reduce the pressure in the LNG storage tank;
secondly, the nitrogen charging device charges the LNG storage tank through the first nitrogen charging pipeline, and the second exhaust pipeline is opened corresponding to the valve for exhausting;
thirdly, stopping filling when the LNG storage tank is filled with nitrogen to about 5KPA by using the first nitrogen filling pipeline, opening valves of the first exhaust pipeline and the second exhaust pipeline to exhaust and release pressure to 0.5KPA, and detecting whether the oxygen content in the tank reaches the standard or not;
and step four, the operation in the step three is circulated until the oxygen content in the detection tank reaches the standard.
Compared with the prior art, the invention has the beneficial effects that: when the LNG storage tank is used for natural gas replacement, the pressure in the LNG storage tank is reduced through the vacuum pump, the first nitrogen charging pipeline and the second nitrogen charging pipeline charge nitrogen into the LNG storage tank, and the gas is exhausted through the first exhaust pipeline and the second exhaust pipeline, so that gas retention at dead corners in the LNG storage tank is reduced, and the gas exhaust efficiency in the LNG storage tank is improved. The device has the advantages of simple structure, simple operation, easy control, economy, practicality, high replacement efficiency and the like.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further described below by combining the specific drawings.
As shown in figure 1 of the drawings, in which,
the embodiment provides a gas transmission and replacement process of an LNG (liquefied natural gas) storage tank 1, which comprises the LNG storage tank 1 and a nitrogen filling device connected with the LNG storage tank and used for replacing natural gas, wherein the nitrogen filling device comprises a liquid nitrogen storage tank 2, a gasification assembly used for liquid nitrogen and an inflation assembly used for filling nitrogen into the LNG storage tank 1, and a buffer tank 3 used for storing nitrogen is arranged between the gasification assembly and the inflation assembly; the inflation assembly is provided with a first nitrogen filling pipeline 11 and a second nitrogen filling pipeline 12 in parallel corresponding to the LNG storage tank 1, the first nitrogen filling pipeline 11 is connected with a valve port of a lower end sealing cover of the LNG storage tank 1, and the second nitrogen filling pipeline 12 is connected with a valve port of an upper end sealing cover of the LNG storage tank 1; the LNG storage tank 1 is provided with a first exhaust pipeline 13 and a second exhaust pipeline 14 which are used for exhausting air corresponding to the inflation assembly, the first exhaust pipeline 13 is connected with an exhaust port of a lower end sealing cover of the LNG storage tank 1, and the second exhaust pipeline 14 is connected with an exhaust port of an upper end sealing cover of the LNG storage tank 1; the upper end of the LNG storage tank 1 is connected with a vacuum pump 15 through a pipeline so as to discharge natural gas in the LNG storage tank 1 in an earlier stage.
In this embodiment, the gasification assembly includes a gasification pipe 21 connected to the liquid nitrogen storage tank 2, an air-temperature gasifier 22 installed in series on the gasification pipe 21, and a water-bath gasifier 23 installed on the gasification pipe 21; the water bath type gasifier 23 is connected to the gasification pipeline 21 in parallel through a gasification branch pipe 24, the gasification branch pipe 24 is provided with a branch pipe ball valve for controlling on-off, and a first ball valve 25 is arranged between the gasification pipeline 21 and the gasification branch pipe 24; specifically, the first ball valve 25 is closed, the two branch pipe ball valves are opened, and the nitrogen in the gasification pipeline 21 is gasified through the water bath type gasifier 23, so that the nitrogen is completely gasified.
In this embodiment, a first pressure gauge 26 and a first temperature gauge 27 are disposed at one end of the air temperature vaporizer 22, which is located on the vaporizing pipe 21 and is far away from the liquid nitrogen storage tank 2, and a check valve 28 is disposed between the vaporizing assembly and the buffer tank 3.
In this embodiment, the inflation assembly includes pressure regulator 31, gas flowmeter 32, second manometer 33 and the pneumatic trip valve 34 of installing on the pipeline in proper order, the pipeline tapping first nitrogen filling pipeline 11 and the second nitrogen filling pipeline 12 of the one end that the second manometer 33 was kept away from to pneumatic trip valve 34.
In this embodiment, the first nitrogen charging pipeline 11 and the second nitrogen charging pipeline 12 are respectively provided with a second ball valve 16 and a third ball valve 17 which are independently controlled to be on and off, and the first exhaust pipeline 13 and the second exhaust pipeline 14 are respectively provided with a fourth ball valve 18 and a fifth ball valve 19 which are independently controlled; the first exhaust line 13 and the second exhaust line 14 are connected to the sweep gas collecting tank 10 in a converging manner.
The embodiment includes a gas transmission and replacement process for an LNG storage tank, which includes the following steps:
the method comprises the following steps that firstly, natural gas in the LNG storage tank 1 is conveyed to a medium-pressure pipe network, and when pressure conveying is not enough provided, the natural gas is extracted by a vacuum pump 15 to reduce the pressure in the LNG storage tank 1;
step two, the nitrogen charging device charges the LNG storage tank 1 through the first nitrogen charging pipeline 11, and the second exhaust pipeline 14 is opened corresponding to a valve for exhausting;
step three, stopping filling when the LNG storage tank 1 is filled with nitrogen to about 5KPA by using the first nitrogen filling pipeline 11, opening valves of the first exhaust pipeline 13 and the second exhaust pipeline 14 to exhaust and release pressure to about 0.5KPA, stopping filling when the LNG storage tank 1 is filled with nitrogen to about 5KPA by using the second nitrogen filling pipeline 12, exhausting and releasing pressure to about 0.5KPA again, and detecting whether the oxygen content in the tank reaches the standard;
and step four, the operation in the step three is circulated until the oxygen content in the detection tank reaches the standard.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (6)

1. The utility model provides a LNG storage tank gas transmission replacement technology, includes the LNG storage tank and connects the LNG storage tank and be used for the nitrogen charging device of replacement natural gas, its characterized in that: the nitrogen filling device comprises a liquid nitrogen storage tank, a gasification assembly for liquid nitrogen and an inflation assembly for filling the LNG storage tank with nitrogen, wherein a buffer tank for storing the nitrogen is arranged between the gasification assembly and the inflation assembly; the gas charging assembly is provided with a first nitrogen charging pipeline and a second nitrogen charging pipeline in parallel corresponding to the LNG storage tank, the first nitrogen charging pipeline is connected with a valve port of a lower end sealing cover of the LNG storage tank, and the second nitrogen charging pipeline is connected with a valve port of an upper end sealing cover of the LNG storage tank; the LNG storage tank is provided with a first exhaust pipeline and a second exhaust pipeline corresponding to the inflation assembly for exhausting, the first exhaust pipeline is connected with an exhaust port of a lower end sealing cover of the LNG storage tank, and the second exhaust pipeline is connected with an exhaust port of an upper end sealing cover of the LNG storage tank; the upper end of the LNG storage tank is connected with a vacuum pump through a pipeline.
2. The LNG storage tank gas transmission and replacement process according to claim 1, wherein: the gasification assembly comprises a gasification pipeline connected with the liquid nitrogen storage tank, an air-temperature gasifier arranged on the gasification pipeline in series and a water bath type gasifier arranged on the gasification pipeline; the water bath type gasifier is connected to the gasification pipeline in parallel through the gasification branch pipe, the gasification branch pipe is provided with a branch pipe ball valve for controlling on-off, and a first ball valve is arranged between the gasification pipeline and the corresponding gasification branch pipe.
3. The LNG storage tank gas transmission and replacement process according to claim 2, wherein: the one end that empty temperature vaporizer was located the liquid nitrogen storage tank of keeping away from on the gasification pipeline is equipped with first manometer and first thermometer, be equipped with the check valve between gasification subassembly and the buffer tank.
4. The LNG storage tank gas transmission and replacement process according to claim 3, wherein: the inflation assembly comprises a pressure regulator, a gas flowmeter, a second pressure gauge and a pneumatic cut-off valve which are sequentially installed on the pipeline, and the pneumatic cut-off valve is far away from the pipeline of one end of the second pressure gauge and is connected with a first nitrogen charging pipeline and a second nitrogen charging pipeline in a tapping mode.
5. The LNG storage tank gas transmission and replacement process according to claim 4, wherein: the first nitrogen charging pipeline and the second nitrogen charging pipeline are respectively provided with a second ball valve and a third ball valve which are independently controlled to be on and off, and the first exhaust pipeline and the second exhaust pipeline are respectively provided with a fourth ball valve and a fifth ball valve which are independently controlled; the first exhaust line and the second exhaust line are connected in a gathering manner to a residual gas collecting tank.
6. The LNG storage tank gas transportation and replacement process according to any one of claims 1 to 5, wherein: which comprises the following steps:
the method comprises the following steps that firstly, natural gas in an LNG storage tank is conveyed to a medium-pressure pipe network, and when pressure conveying is not enough provided, the natural gas is extracted by a vacuum pump to reduce the pressure in the LNG storage tank;
secondly, the nitrogen charging device charges the LNG storage tank through the first nitrogen charging pipeline, and the second exhaust pipeline is opened corresponding to the valve for exhausting;
thirdly, stopping filling when the LNG storage tank is filled with nitrogen to about 5KPA by using the first nitrogen filling pipeline, opening valves of the first exhaust pipeline and the second exhaust pipeline to exhaust and release pressure to 0.5KPA, and detecting whether the oxygen content in the tank reaches the standard or not;
and step four, the operation in the step three is circulated until the oxygen content in the detection tank reaches the standard.
CN202010009489.4A 2020-01-06 2020-01-06 LNG storage tank gas transmission and replacement process Pending CN111219594A (en)

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CN113464842A (en) * 2021-06-28 2021-10-01 江阴华西化工码头有限公司 Overhead exhaust treatment device for pipeline

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